// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_TREES_OCCLUSION_H_
#define CC_TREES_OCCLUSION_H_

#include <string>

#include "cc/base/cc_export.h"
#include "cc/base/simple_enclosed_region.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/transform.h"

namespace cc {

class CC_EXPORT Occlusion {
public:
    Occlusion();
    Occlusion(const gfx::Transform& draw_transform,
        const SimpleEnclosedRegion& occlusion_from_outside_target,
        const SimpleEnclosedRegion& occlusion_from_inside_target);
    Occlusion GetOcclusionWithGivenDrawTransform(
        const gfx::Transform& transform) const;

    bool HasOcclusion() const;
    bool IsOccluded(const gfx::Rect& content_rect) const;
    gfx::Rect GetUnoccludedContentRect(const gfx::Rect& content_rect) const;

    bool IsEqual(const Occlusion& other) const;
    std::string ToString() const;

private:
    gfx::Rect GetUnoccludedRectInTargetSurface(
        const gfx::Rect& content_rect) const;

    gfx::Transform draw_transform_;
    SimpleEnclosedRegion occlusion_from_outside_target_;
    SimpleEnclosedRegion occlusion_from_inside_target_;
};

} // namespace cc

#endif // CC_TREES_OCCLUSION_H_
